Add a QCA vendor sub command QCA_NL80211_VENDOR_SUBCMD_OEM_DATA
with attributes qca_wlan_vendor_attr_oem_data_params to support
OEM data. It is used to send OEM data binary blobs from
application/service to firmware. The attributes defined in enum
qca_wlan_vendor_attr_oem_data_params are used to deliver the
parameters.
Signed-off-by: Paul Zhang <paulz@codeaurora.org>